Relief-valve.



F. H. CARSSGW.

EELIEE VALVE.

APPLICATION FILED JUNI] 21, 1909.

Patented Aug. 9, 1910.

Z SHEETS-SHEET 1.

firunllum FELIX H. CARssow F. H. ARSSW. RELIEF VALVE.

PPLIUATION FILED JUNE 21, 1909.

2 BHBETB-BHEET 2.

UNITED sTATEsr PATENT OFFICE..

FELIX H. CARSSOW, OF SAN FRANCISCO, CALIFORNIA.

RELIEF-VALVE.

Specification of Letters Patent.

Application iled .Tune 21, 1909. Serial No. 503,537.

Patented Aug. 9, 1910..

My invention relates to improvements in,\ relief or safety valves for 'gas compressors or receivers.

The objects of my invention are: first, to

provide a gas relief or safety valvewhich will open and instantly permit the reduction ofthe gas pressure within the cylinder or system to which it is attached, and will Yprevent leaking of` gas between the face and seat; second, to afford easy facility for reversing or renewing the' valve face disk;

' and third, to indicate by means of a diaphragm whether or not the valve has been very slightly raised, and did not settleback gastight, thereby permitting a slight leakage of as into the Valve; the diaphragm also sealing the interior of thevalve from the air and trapping the leakage.

The invention by which these objects are i attained consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed,

havingl reference to' the accompanyingV drawings, in whichl Figure 1 is averti'cal section through the center vof the valve, taken along the line and gasket removed. Figs. 3, 4 and 5 are sections showing variations of the valve face disks. Fig.' 6 is a section of a modified i form of valve for' use in large sizes. i 4o angle, in these drawin s it is`sliown as vertical, and 1s tion.

Although the valvefmay be placed at any so descri ed in this specificainto the valve head and turned u as at 5, toV

pass through the guide at 6, an the top of thehead 5 is designed to serve as a seat for,

the compression spring 7, by which the releasing pressure of the valve is regulated ical means. A-A,'Fig. 2. Fig. 2 is a view of the top of v the valve, with the locking cap, lifting nut,

disk is held in contact with the circular knife edge 2. The bottom of the valve head is hollowed out, so that the soft metal disk 8 may be inserted therein, and Yfrom which it may be readily removed when it is desirable to reverse it, or re lace it with another.

9 is an exterior y threaded guide sleeve and' spring seat through. which the stem 4 passes and slidesfreely; the stem being prevented from turning by a pin 10 working in a longitudinal slot l1. Sleeve 9 screws into the top of casing 3 and a cap 12 screws on over the sleeve and houses in the parts and forms a tight air seal by means of the packing 13.

and by which the.l soft metalpvaljve face or The upper extremity of the valve stem is threaded to receive the lifting nut` lllby `which the valve is raised and lowered, and the spring 7 compressed and released. By compressing the spring with the lifting nut sufiiciently to removeA the pressure from between'the valvek face disk 8 and the Valve seat '2, it makes. easy the removal of the spring-adjusting sleeve 9 with the spring,

valve hea-d and stem, lifting nut, and valve face disk as a unit, so -that the'valve face disk 8 may be reversed or' renewed.

The pin 10 is t'o prevent the valve stem from turning when tightening-or looseningy the lifting nut. Manifestly, this object may be accomplished' by lsome'other mechan- The threads of thel sleeve 9 have numbers stamped on them, and the top of the casing has radial lines ruled on it, and these also numbered as represented in Fig. 3, so that the valve may same spring compression.

vThe discharge outlet 16 is sealed with `anv elastic diaphragm or wafer 17 of'rubber or the like, held in place by the ring 18 and gasket. 19, making a gastight joint between the diaphragm and casing, and sealing the valveoutlet 16 from the air.

This sealing up or confining of the gas within the valve does not materially increase` the pressure above the valve, -as the diaphragm is designed to stretch and be ru tured at a low pressure.` If a soft` metallic dia hra is used. instead 'of the non-metallic, e astio diaphragm A17 the ring 18 may be dispensed with. The, discharge outlet 16 may com- `municate by piping with the suction ofthe gas compressor or some other place, in which case the diaphragm or wafer 17 and its associated parts 18 and 19 may be omittedt be reset to the i for the valve spindle 4.

Fig. 6l is a sectional view of a valve similar to that shown in Fig. 1, and intended to serve a similar purpose, but modified in construction due to increase in size. In this valve the annular seat 2 is made as a separate part of the valve casing or base, and

screwed or fitted into a receptacle designed v valve. The upperend of the springcoinpression nut is threadedto receive the locking cap 12', and its upper extremity is squared o', as at 10', to aord a grip for a wrench wherebyit may be turned. Thel locking cap 12a is screwed to the top of the spring compression nut when it is in its de'- sired positlon, lockingthe same, and also sealing the interior of the valve. The valve seat 2 mayl have slots 20 -or equivalent to give a hold to a spanner wrench or other suitable tool so that the seat may be screwed onor olf. In this valve the discharge outlet 16 may be covered with a diaphragm 17 similar to 17, or may be made to communicate with piping with the suction of the compressor or some other place.

In practice, one of these valves 'is set by l suitably manipulating the adjusting screw 9 or 9 so that the valve will normally remain closed on its seat 2 or 2 upto a predetermined pressure,above which the valve will open. In case the pressure in the receiver 4or compressor exceeds this predetermined maximum, the valve is opened against the compression of the spring 7 or 7 and the 'escape of the gas into theV outlet 16 or 16' will result in the distention and bursting of the diaphragm or wafer 17 and escape of the gas into the open air, or, in the case where the outlet communicates. by piping with the suction or some other point, the escaping gas is conducted to the communicating point.

When the pressure has been reduced to asafety point, vthe valve' reseats itself under the action of the spring 7 or 7. In case the valve has been very slightly vraised and has not settled back gastight on to its seat, the same will be readily recognized by the condition or appearance of the diaphragm when the diaphragm is used. The diaphragm has also the effect of completely sealing up and confining the gaswithin the valve; and by reason of this sealed diaphragm and the sealing cap 18, and employing a soft metal disk face 8 or 8- an absolutely gas and airtight valve is produced. This reversible soft metal seat 8 or 8 is anl important feature,

because it coperates with the sharp hard metal knife edge 2 or 2 to form a tight joint. The metal face 8 or /S- may be given an inclined conical surface, wedging either inside or voutside of the correspondingly shaped surfaces of theknife edge 2 or 2, as shown in the drawings. This combination of a hard circular edge or annular seat with the coacting soft metal disk gives a minimum surface of contact, and when acted upon by a spring a relatively great pressure is produced' between these contacting surfaces, thereby preventing the escape of gas between them until the pressure beneath the valve 'face exceeds a predetermined amount; whereupon the valve is raised and opened, affording-instant relief to the cylinder or system to which it is attached.

One of the important features of this valve construction is lthat the guide for the valve head is above the valve seat, so that when the valve opens the fluid passageway in the valve is uninterrupted.

My construction is notably diiferent from the ordinary relief valvesin that my valve stem and xed guide for the valve head are positioned as shown so as to give a clear passageway to the escaping luid when such an undesired pressure 1s exerted on the underside of the valve head as to render relief necessary. v v

Having thus described my invention, what I claim and desire to secure by Letters- Patent, is:

1. In a relief valve, the combination of a casing inclosing an annular knife-edge seat and afvalve member contacting therewith havinga projecting stem, the contactv portion of said valve member comprising a reversible soft met-al seat, a spring acting on the valve member to maintain the latter normally closed, and means engaging said stem'v adapted to raise and lower the stem to ad- Y just the tension of the spring and to hold the valve member with its spring and stem so that these arts may be removed as a unit.

2. In a rellef valve, the combination of a casing inclosing an annular knife-edged seat, a valve member coacting therewith, said valve member havin a stem, a head with a recess and a reversile and replaceable disk in said recess, said disk forming a face to rest on said annular seat, means for pressin said face yieldingly against its seat, and means for adjustin the relief valve Lto any desired blowing-o pressure, said means comprising an adjusting sleeve through which the stem passes, and a nut engaging the stem and serving to unite the valve member with its stem and head and the sleeve so that these parts may be removed as a'unit.

3. In a relief valve, the combination of a vcasing inclosing an. annular knife-ed ed seat, a valve member coacting therewlth,

comprising an said valve member having a stem, a head with a recess and a reversible and replaceable disk in said recess, said disk formin a face to rest on said annular seat, means Ior pressin said face yieldingl against its seat, means or adjustin the re ief valve to any desired blowing-ot? pressure, said means adjusting sleeve through which the stem passes, 'and a nut engaging the stein and serving to unite the valve member with its stem and headandthe sleeve so that these parts may be removed as a unit and means whereby the valve face may be reversed or replaced, and the valve reset to its original blowing off pressure.

4: In a relief valve, thecombination of a casing having an inlet and an outlet, a valve closing the inlet 'and stem, an adjustable guide member for the stem, a fixed guide member for the valve head above the valve seat, a sprin v interposed between the adjustable mem er and head to maintain the valve normall over the inlet, the upper end" of. the stem threaded,a nut fitting said threaded portion and coacting with said guide member to raise the valve, and means whereby the nut maybe turned relative to the valve stem.

stem, and afixe head above the 5. In a relief valve, the combination of a casing inclosing a separable annular knifeedge-seat, a valve member coacting therewith, said valve member having `a head with a recess and a soft metal disk in said recess, and said disk forming a face to rest `on said annular seat, and means for pressing said face yieldingly against its seat, said knife edge and said disk having coacting contacting surfaces. y

6. In a relief valve, the combination of a casing having an inlet and an outlet, a valve closing the inlet and said valve having a stem, an adjustable guide `member for the guide member for the valve valve seat, a spring interposed between the adjustable guide member and head to maintain the valve normally closed over the in1et,'the upper end of the stem threaded, a nut fitting said threaded portion and coacting with said guide member to' raise the valve, and means for preventing the stem from turning.

7. In a relief valve, casing havin an inlet and an outlet, a valve closing the inlet and said valve having a stem, an ad'ustable guide member for the stem, and a Xed guide member for the .valve head above the valve seat, a spring interposed between the adjustable guide member said valve having aclosed the combination of a' and lhead to maintain the valve normally closed over the inlet, the upper end of the stem threaded, a nut fitting said threaded portion and coactin with said guide member to raise the va ve, said stem being provided with means so that the stem may be prevented from turning when said nut is operated.

8. In a relief valve, the combinationof acasing having an inlet and an outlet, a valve in the inlet, and said `valve having a stem, an adjustable guide member for the stem, a spring interposed between. the guide member and head to maintain the valve nor mally closed over the inlet, the up of the stem threaded, a nutv ittin said threaded port-ion and coacting wit said ide member to'raise the valve, said stem ving fa longitudinal slot, anda pin carried by the guide member and fitting said slot to prevent the stein from turning when said nut is` operated.

9. In a relief-valve, the combination of a casing having. 'anfinlet and an outlet, a valve in the inlet, and said an adjustable guide member for the stem, a sprin inter osed between the guide member an 4headp to maintain the valve normally'elosed over the'inlet, the adjustable 4guide member `compressing the spbring so the esired valve may be set to any lowing oif pressure, the upper end of the stem threaded, a nut fitting said threaded acting with said guide mem er to raise the valve, said ste'm being provided with'means so that the stem may be prevented from turning when said nut isioperated.

10. In a gas relief or safety valve, the combination of a valve head andl stem, reversible and replaceable face, lodged 1n the valve head, said valve stem being threaded at the top, a nut engaging said stem and adjustingv sleeve, an meansI whereby the stem is, or may be held while the nut 1sbeing turned relatively to the same, so that the valve face may be raised from or lowered onto itsseat, to make reversal or renewal of the valve face eas and the resetting of the valve to its original blowing off pressure easy and certain.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FELIX H. GARSSOV.

' Witnesses: l

j CHARLES EDELMAN, W. DAR.

per end y ortion and coico iio 

